Perhaps you should try some spelling variations:
"single chains" » "single domains", "single chip", "single class"
"single charge" » "single case", "single target", "single core"
"entire chain" » "entire brain", "entire domain", "entire change"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("entire chain") OR ("single chain"))) OR ((((("single chains") OR ("single charge"))) OR ("single channel")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"entire chain\") or (\"single chain\"))) or (((((\"single chains\") OR (\"single charge\"))) or (\"single channel\"))))".
• Removing quotes may allow a broader search: (((( entire chain ) or ( single chain ))) or ((((( single chains ) OR ( single charge ))) or ( single channel )))).
• Adding a wildcard symbol may retrieve word variants: (((("entire chain") or ("single chain"))) or ((((("single chains") OR ("single charge"))) or ("single channel"))))*.